The difference between Extra and Superfluous
When used as adjectives, extra means beyond what is due, usual, expected, or necessary, whereas superfluous means in excess of what is required or sufficient.
Extra is also noun with the meaning: something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill.
Extra is also adverb with the meaning: to an extraordinary degree.
check bellow for the other definitions of Extra and Superfluous
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Extra as an adjective:
Beyond what is due, usual, expected, or necessary; extraneous; additional; supernumerary.
Examples:
"extra work; extra pay"
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Extra as an adjective (dated):
Extraordinarily good; superior.
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Extra as an adjective (North America, slang):
Over-the-top; going beyond what is normal or expected, often in a dramatic manner.
Examples:
"You deleted your photos of her because she lost your Snapchat streak!? You're so extra!"
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Extra as an adverb (informal):
To an extraordinary degree.
Examples:
"That day he ran to school extra fast."
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Extra as a noun:
Something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill.
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Extra as a noun:
An extra edition of a newspaper, which is printed outside of the normal printing cycle.
Examples:
"Extra, extra! Read all about it!"
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Extra as a noun (cricket):
A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball; in Australia referred to as a sundry.
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Extra as a noun (acting):
A supernumerary or walk-on in a film or play.
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Extra as a noun:
Something of an extra quality or grade.
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Superfluous as an adjective:
In excess of what is required or sufficient.
Examples:
"With a full rain suit, carrying an umbrella may be superfluous."